python关于类的问题

设计一个基类shape。该类包含3个属性：图形名称（name）、图形面积（area）和图形周长（perimeter）。该类包含3个成员函数：calArea（）—计算并返回该图形的面积；calPerimeter（）—计算并返回该图形的周长；display（）—打印输出图形名称、面积、周长。设计3个派生类：Rectangle、Triangle、Circle，请为派生类定义合适的数据成员用于表达其结构，派生类应重载实现基类中的全部成员函数。

有用请采纳

class Shape:
    def __init__(self, name):
        self.name = name
        self.area = 0.0        # 面积
        self.perimeter = 0.0   # 周长

    def calArea(self):
        return self.area

    def calPerimeter(self):
        return self.perimeter

    def display(self):
        print("name = ", self.name)
        print("area = ", self.area)
        print("perimeter = ", self.perimeter)


class Rectangle(Shape):
    def __init__(self, name, width, height):  # width为宽， height为高
        Shape.__init__(self, name)
        self.width = width
        self.height = height
        self.area = self.calArea()
        self.perimeter = self.calPerimeter()

    def calArea(self):
        return self.width * self.height

    def calPerimeter(self):
        return (self.width + self.height) * 2

    def display(self):
        print("name = ", self.name)
        print("area = ", self.area)
        print("perimeter = ", self.perimeter)



class Triangle(Shape):
    def __init__(self, name, a, b, c, height):  # a, b, c为3边， height为a对应的高
        Shape.__init__(self, name)
        self.a = a
        self.b = b
        self.c = c
        self.height = height
        self.area = self.calArea()
        self.perimeter = self.calPerimeter()

    def calArea(self):
        return self.a * self.height / 2

    def calPerimeter(self):
        return self.a + self.b + self.c

    def display(self):
        print("name = ", self.name)
        print("area = ", self.area)
        print("perimeter = ", self.perimeter)


class Circle(Shape):
    def __init__(self, name, r):  # r为半径 ， 取PI = 3.14
        Shape.__init__(self, name)
        self.r = r
        self.area = self.calArea()
        self.perimeter = self.calPerimeter()

    def calArea(self):
        return self.r * self.r * 3.14

    def calPerimeter(self):
        return 2 * 3.14 * self.r

    def display(self):
        print("name = ", self.name)
        print("area = ", self.area)
        print("perimeter = ", self.perimeter)